x-1/x=7 হলে, x2+1/x2 এর মান হবে-  

A    47

B    42

C    51

D    54

Solution

Correct Answer: Option C

 

x-1/x=7

=> (x-1/x)2 = 72

=> x2 -2.x.1/x + (1/x)2 = 49

=> x2 + 1/x2 -2 = 49

=>  x2 + 1/x2 =49 + 2 =51

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